Add support for compiling on macOS

[ids1024]

Dubiously useful, but doesn't take much, and it's a useful reference point for portability to different Unix systems.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (15a897e) 64.46% compared to head (7dc69d2) 73.16%.

❗ Current head 7dc69d2 differs from pull request most recent head a53ede1. Consider uploading reports for the commit a53ede1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #641      +/-   ##
==========================================
+ Coverage   64.46%   73.16%   +8.70%     
==========================================
  Files          42       47       +5     
  Lines        7074     7732     +658     
==========================================
+ Hits         4560     5657    +1097     
+ Misses       2514     2075     -439     

Flag	Coverage Δ
main	58.67% <100.00%> (?)
test--	78.17% <100.00%> (?)
test--server_system	61.32% <75.00%> (-3.14%)	⬇️
test-client_system-	69.21% <100.00%> (?)
test-client_system-server_system	51.17% <0.00%> (?)

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